Nitrogen is made available in a useful form for animals in the A. fertilizers they absorb. B. plants they eat. C. air they breathe. D. rainwater they drink.

What is nicknamed the "powerhouse" of the cell?

What fertility technique extracts ova, combines them with sperm, and after a few days, implants two or three blastocysts into the woman's uterus?

If plants make sugar, then what elements must be found in starches?

Which of the following structures is most likely to be found i an autotrophic protist

Give four examples of ecological interdependence

According to condensuon theory, the most important factor for the formation of our plant was

Which of the following are functions of lipids? Choose three correct answers. A. forming the exoskeletons of insects B. forming waxy leaf coverings C. forming bones and cartilage D. storing energy in fat cells E. forming cell membranes F.

The ability of the body to undergo prolonged whole body, large muscle activity is:

In humans a gene that has been identifoef as causing a type of skin cancer is the

Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?